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package muhnes.sizoo.listener;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import muhnes.sizoo.HibernateUtilSeguridad;
import org.hibernate.SessionFactory;
import org.hibernate.StaleObjectStateException;

public class PeticionFilter implements Filter {
 
    private SessionFactory sf;
    
 
    @Override
    public void doFilter(ServletRequest request,
                         ServletResponse response,
                         FilterChain chain)
            throws IOException, ServletException {
 
        try {
            
            sf.getCurrentSession().beginTransaction();
 
            // Call the next filter (continue request processing)
            chain.doFilter(request, response);
 
            // Commit and cleanup
            sf.getCurrentSession().getTransaction().commit();
 
        } catch (StaleObjectStateException staleEx) {
            // Rollback, close everything, possibly compensate for any permanent changes
            // during the conversation, and finally restart business conversation. Maybe
            // give the user of the application a chance to merge some of his work with
            // fresh data... what you do here depends on your applications design.
            throw staleEx;
        } catch (Throwable ex) {
            // Rollback only
            ex.printStackTrace();
            try {
                if (sf.getCurrentSession().getTransaction().isActive()) {
                    
                    sf.getCurrentSession().getTransaction().rollback();
                }
            } catch (Throwable rbEx) {
            }
 
            // Let others handle it... maybe another interceptor for exceptions?
            throw new ServletException(ex);
        }
    }
 
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        sf = HibernateUtilSeguridad.getSessionFactory();
        
    }
 
    @Override
    public void destroy() {}
 
}
